Add: Support for D-step version of BCM2712 Raspberry Pi 5

Add machine db entry for D-step version of BCM2712 Raspberry Pi 5.

Reference:

• Raspberry Pi revision codes: https://github.com/raspberrypi/documentation/blob/master/documentation/asciidoc/computers/raspberry-pi/revision-codes.adoc
• https://lore.kernel.org/r/20241025-drm-vc4-2712-support-v2-36-35efa83c8fc0@raspberrypi.com

Signed-off-by: Kurva Prashanth krvprashanth@riseup.net